Basically any clip that presents me with yet another woman who's been tied up, for some unknown reason, and literally nothing is said at all and then bang... The tickling starts. On and on it goes, then it stops and the clip is done. In my experience this is most clips, but it's worth mentioning that I don't have enormous viewing experience. Basically clips where there isn't even an attempt at the most basic of plots. Might be hard to take at all seriously... Since most producers use a lot of the same models. It really does get so boring though, I've found that I enjoy looking at still images far, far more than even the sample clips you get. Imagination is almost always better than the reality, makes sense though since lets face it they're being paid to do it. On a side note, there are people that make illustrated stories using gifs / stills and personally I find them way, way better than virtually any clip. I'm well aware that's because a real life woman would never want any part of those situations should they become real btw 🙂
Feathers, too. I know they work with some people, I used to be in a relationship with one such person, but I still can't seem to take it seriously when it comes up in a clip. There may be people reading that thinking "wtf man?" but, that's how I feel about feathers. Same as the guys that don't believe a hairbrush, for example, is really something you'd tickle someone with. I say "wtf?" to that, it most definitely is. Same goes for toothbrushes, just keep in mind the tickler isn't using their personal toothbrush, amazingly hygiene was a concern for one person...
Also one particular model, very hot, ticks literally every box UNTIL she's actually being tickled and then the "oh my god" spam seems to start. This happens in both tickling and orgasm clips so maybe that's just her normal reaction, who knows. Fortunately she is a very sexy and cruel tickler so, for me at least, can happily stay forever on the giving end.
Erm... Elaborate bondage, maybe. I've seen clips in the past where the models are bound in such uncomfortable looking positions (models that are very well known with many producers btw) with several straps on what looks like every part of their body, it seems to negatively affect their sensitivity to any tickling. Even saw one have to stop because the position was just too painful to keep being stuck in after 15 or 20 minutes I think... It's just, awkward.
And as others said, screamers. It is so irritating, again probably their natural reaction and that's fine everyone is different but seriously, guys, if you know they're a screamer please just gag them.